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Instruo aradh User Manual

Transistor ladder filter
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àradh
Transistor Ladder Filter
User Manual

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Summary of Contents for Instruo aradh

  • Page 1 àradh Transistor Ladder Filter User Manual...

  • Page 2: Table Of Contents

    Contents Description / Features Patch Examples East Coast Synth Voice West Coast Synth Voice Installation / Specifications Impulse Envelope Extractor - Compressor - Expander Overview - Noise Gate I/O - Filter & VCA Control Voltage Primary User-Defined Parameter Secondary User-Defined Parameter Envelope Follower &...
  • Page 3 Description By popular demand – an exciting new take on the legendary transistor ladder filter. Introducing the Instruō àradh, the long-awaited successor to the first Instruō low pass filter, tràigh. Expanding on tràigh’s classic functionality, àradh adds a VCA with pre or post-filter routing options, an envelope follower, a comparator gate, a strike input with variable decay time, and a plethora of user-definable voltage-controlled parameter combinations.
  • Page 4 Installation 1. Confirm that the Eurorack synthesiser system is powered off. 2. Locate 6 HP of space in your Eurorack synthesiser case. 3. Connect the 10 pin side of the IDC power cable to the 2x5 pin header on the back of the module, confirming that the red stripe on the power cable is connected to -12V.
  • Page 5 àradh | La:rəxg | noun (vestige) a range of operation, a marked effect, impression, or impact – BIAS 1V/OCT POST GATE FOLLOW DECAY STRIKE àradh 1. Input (In) 9. Strike Button 2. Output (Out) 10. Decay Knob 3. Filter Cutoff ( ) Knob 1 1.

  • Page 6: I/O - Filter & Vca

    Input (In): Input is an AC coupled audio input to the low pass filter and VCA. Output (Out): Output is an AC coupled audio output from the low pass filter and VCA. Filter & VCA Filter Cutoff ( ) Knob: Filter Cutoff Knob controls the cutoff frequency of the low pass filter.
  • Page 7 • This is traditionally used with pitch-related control voltages sent from a sequencer or keyboard. • Filter Control voltage is summed with the value set by the Cutoff Knob. Bias Knob: Bias Knob sets the level of the VCA. • If no control voltage is present, unity gain of the VCA is achieved when the Bias Knob...
  • Page 8 Strike Input: Strike Input is a gate/trigger input for the impulse envelope. Rising edge signals present at the Strike Input will trigger the impulse envelope which modulates both the cutoff frequency of the low pass filter and the amplitude of the VCA. •...

  • Page 9: Control Voltage

    Control Voltage CV Input ( CV Input is a bipolar control voltage input for the amplitude of the VCA, the cutoff frequency of the low pass filter, the resonance of the low pass filter, and/or the decay time of the impulse envelope, based on the targeted primary and/or secondary user- defined parameter(s).

  • Page 10: Primary User-Defined Parameter

    Primary User-Defined Parameter Multiple primary user-defined parameters can be set. Primary user- defined parameters can work simultaneously with the secondary user- defined parameters (See the Secondary User-Defined Parameters section for more information). Press the CV Assign Button to set primary user-defined parameters. •...

  • Page 11: Secondary User-Defined Parameter

    Secondary User-Defined Parameter In addition to the primary user-defined parameters, secondary user- defined parameters can also be set. Secondary user-defined parameters can work simultaneously with the primary user-defined parameters (See Primary User-Defined Parameters section for more information). To set secondary user-defined parameters, press and hold the Assign Button and then press the Strike Button...

  • Page 12: Envelope Follower & Comparator

    Envelope Follower & Comparator Gate/Follow Output: Based on the position of the Gate/Follow Toggle, the Gate/Follow Output will output either the comparator- based gate signal, the envelope follower signal, or no signal at all. Gate/Follow Toggle: Gate/Follow Toggle sets the behaviour of Gate/Follow Output.
  • Page 13 • Performing this action and setting the Pre/Post Switch to its downward position will pull the envelope signal from the pre-filter input signal. • Performing this action and setting the Pre/Post Switch to its upward position will pull the envelope signal from the post-filter input signal.

  • Page 14: Factory Reset

    Factory Reset Press and hold both the CV Assign Button and the Strike Button switch the Gate/Follow Toggle up and down 3 times. This will set no target for both the primary user-defined parameter and the secondary user-defined parameter. It will also initialise the attack time and release time of the envelope follower and set it to post-filter.
  • Page 15 Patch Examples East Coast Synth Voice: Summary: The sequencer or keyboard controls the pitch of an oscillator while simultaneously triggering an envelope generator. The CV output of the envelope generator simultaneously opens àradh’s low pass filter and VCA, allowing the oscillator signal to pass through. Keyboard tracking is also implemented in this patch Gate Signal 1V/Oct Signal...
  • Page 16 Control Path: • Connect the 1V/Oct output of a sequencer or keyboard to a buffered multiple. • A buffered multiple will keep the signal from dropping voltage when split. • Connect one copy of the 1V/Oct signal to the 1V/Oct input of the oscillator and connect another copy of the 1V/Oct signal to the 1V/Oct Input of àradh.
  • Page 17 West Coast Synth Voice: Summary: A random voltage generator controls the pitch of an oscillator while simultaneously striking àradh’s low pass filter and VCA, allowing the oscillator signal to pass through. Output Gate Signal Audio Path: • Connect a harmonically rich waveform of an oscillator to the Input of àradh.
  • Page 18 Control Path: • Connect the random voltage output of the random voltage generator to the 1V/Oct input of the oscillator • Connect the gate output of the random voltage generator or Strike Input keyboard to the of àradh. • Decay Knob Set the to a desired position...
  • Page 19 Impulse Envelope Extractor: Summary: The impulse envelope simultaneously modulates the cutoff frequency of the low pass filter and the level of the VCA. With an audio signal present at the Input as a signal reference, the impulse envelope will generate an audio impulse which produces an envelope from the Gate/Follow Output.
  • Page 20 Control Path: • Gate/Follow Toggle Set the to its downward position to access the envelope follower. • Decay Knob Set the to a desired position • Strike Input Trigger the with a gate or trigger signal or manually Strike Button press the to trigger the impulse envelope.

  • Page 21: Compressor

    Compressor: Summary: àradh is patched to work as a traditional downward compressor, where the CV Attenuverter acts as the threshold parameter, Bias Knob acts as the make-up gain parameter, and the envelope follower sets the attack and release times. Output Kick Audio Path: •...
  • Page 22 • Set the Pre/Post Switch to its downward position, so that the VCA is routed pre-filter. • Monitor the Output of àradh. Control Path: • CV Assign Button Set the to its white primary user-defined parameter. • This allows modulation to be applied to the level of the VCA. •...
  • Page 23 Expander: Summary: àradh is patched to work as a traditional upward expander, where the CV Attenuverter acts as the threshold parameter, the Bias Knob acts as the starting gain parameter, and the envelope follower sets the attack and release times. Output Kick Audio Path:...
  • Page 24 • Set the Pre/Post Switch to its upward position, so that the VCA is routed post-filter. Monitor the Output of àradh. Control Path: • Set the CV Assign Button to its white primary user-defined parameter. • This allows modulation to be applied to the level of the VCA. •...
  • Page 25 Noise Gate: Summary: àradh is patched to work as a traditional noise gate, where CV Attenuverter acts as the threshold parameter, the Bias Knob acts as the starting gain/minimum amplitude parameter, and the envelope follower sets the attack and release times. Kick Output Audio Path:...
  • Page 26 Control Path: • Set the location of where the envelope follower signal is derived from to pre-filter. • CV Assign Button Set the to its white primary user-defined parameter. • This allows modulation to be applied to the level of the VCA. •...